// SPDX-License-Identifier: GPL-2.0-only
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/*
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* STMicroelectronics st_lsm6dsr spi driver
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*
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* Copyright 2020 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi@st.com>
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include "st_lsm6dsr.h"
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#define SENSORS_SPI_READ BIT(7)
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static int st_lsm6dsr_spi_read(struct device *dev, u8 addr, int len,
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u8 *data)
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{
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struct spi_device *spi = to_spi_device(dev);
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struct st_lsm6dsr_hw *hw = spi_get_drvdata(spi);
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int err;
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struct spi_transfer xfers[] = {
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{
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.tx_buf = hw->tb.tx_buf,
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.bits_per_word = 8,
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.len = 1,
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},
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{
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.rx_buf = hw->tb.rx_buf,
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.bits_per_word = 8,
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.len = len,
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}
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};
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hw->tb.tx_buf[0] = addr | SENSORS_SPI_READ;
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err = spi_sync_transfer(spi, xfers, ARRAY_SIZE(xfers));
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if (err < 0)
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return err;
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memcpy(data, hw->tb.rx_buf, len * sizeof(u8));
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return len;
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}
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static int st_lsm6dsr_spi_write(struct device *dev, u8 addr, int len,
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const u8 *data)
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{
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struct st_lsm6dsr_hw *hw;
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struct spi_device *spi;
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if (len >= ST_LSM6DSR_TX_MAX_LENGTH)
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return -ENOMEM;
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spi = to_spi_device(dev);
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hw = spi_get_drvdata(spi);
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hw->tb.tx_buf[0] = addr;
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memcpy(&hw->tb.tx_buf[1], data, len);
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return spi_write(spi, hw->tb.tx_buf, len + 1);
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}
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static const struct st_lsm6dsr_transfer_function st_lsm6dsr_transfer_fn = {
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.read = st_lsm6dsr_spi_read,
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.write = st_lsm6dsr_spi_write,
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};
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static int st_lsm6dsr_spi_probe(struct spi_device *spi)
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{
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return st_lsm6dsr_probe(&spi->dev, spi->irq,
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&st_lsm6dsr_transfer_fn);
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}
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static int st_lsm6dsr_spi_remove(struct spi_device *spi)
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{
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return st_lsm6dsr_remove(&spi->dev);
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}
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static const struct of_device_id st_lsm6dsr_spi_of_match[] = {
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{
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.compatible = "st,lsm6dsr",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, st_lsm6dsr_spi_of_match);
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static const struct spi_device_id st_lsm6dsr_spi_id_table[] = {
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{ ST_LSM6DSR_DEV_NAME },
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{},
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};
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MODULE_DEVICE_TABLE(spi, st_lsm6dsr_spi_id_table);
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static struct spi_driver st_lsm6dsr_driver = {
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.driver = {
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.name = "st_lsm6dsr_spi",
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.pm = &st_lsm6dsr_pm_ops,
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.of_match_table = of_match_ptr(st_lsm6dsr_spi_of_match),
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},
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.probe = st_lsm6dsr_spi_probe,
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.remove = st_lsm6dsr_spi_remove,
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.id_table = st_lsm6dsr_spi_id_table,
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};
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module_spi_driver(st_lsm6dsr_driver);
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MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics st_lsm6dsr spi driver");
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MODULE_LICENSE("GPL");
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